First of all the your water burning rate is very high, 2 cups become 1 cup in total 20 minutes. May be this is probably on a high flame, have you tried at a very low flame?
IMO, if you take half a cup extra water and keep it on a low or medium flame you will not lose too much water. Also use 2 tbsp. raw coffee instead of one. Then you can do two back to back enemas, one cup each.
I don't see any reason to have two saline water enemas before and after. If you feel your colon is not clean then go ahead, but once you do the coffee enema the colon dumps all toxins out that liver dumps in the colon, this takes may be 10 to 12 minutes of holding coffee in your colon.
I have never felt the elation with enemas that I feel with the liver flush, but enemas are still very effective.
We have talked about this before, lymph moves with activity, jumping up and down, and with head stand.